215 lines
6.8 KiB
YAML
215 lines
6.8 KiB
YAML
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/display/panel/panel-timing.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: panel timing
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maintainers:
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- Thierry Reding <thierry.reding@gmail.com>
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- Sam Ravnborg <sam@ravnborg.org>
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description: |
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There are different ways of describing the timing data of a panel. The
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devicetree representation corresponds to the one commonly found in datasheets
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for panels.
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The parameters are defined as seen in the following illustration.
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+-------+----------+-------------------------------------+----------+
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| | | ^ | |
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| | | |vsync_len | |
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| | | v | |
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+-------+----------+-------------------------------------+----------+
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| | | ^ | |
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| | | |vback_porch | |
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+-------+----------#######################################----------+
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| | # ^ # |
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| | # | # |
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| hsync | hback # | # hfront |
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| len | porch # | hactive # porch |
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|<----->|<-------->#<-------+--------------------------->#<-------->|
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| | # | # |
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| | # |vactive # |
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| | # | # |
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| | # v # |
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+-------+----------#######################################----------+
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| | | ^ | |
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| | | |vfront_porch | |
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| | | v | |
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+-------+----------+-------------------------------------+----------+
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The following is the panel timings shown with time on the x-axis.
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This matches the timing diagrams often found in data sheets.
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Active Front Sync Back
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Region Porch Porch
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<-----------------------><----------------><-------------><-------------->
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//////////////////////|
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////////////////////// |
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////////////////////// |.................. ................
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_______________
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Timing can be specified either as a typical value or as a tuple
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of min, typ, max values.
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properties:
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clock-frequency:
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description: Panel clock in Hz
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hactive:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: Horizontal panel resolution in pixels
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vactive:
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$ref: /schemas/types.yaml#/definitions/uint32
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description: Vertical panel resolution in pixels
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hfront-porch:
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description: Horizontal front porch panel timing
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$ref: /schemas/types.yaml#/definitions/uint32-array
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oneOf:
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- maxItems: 1
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items:
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description: typical number of pixels
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- minItems: 3
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maxItems: 3
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items:
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description: min, typ, max number of pixels
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hback-porch:
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description: Horizontal back porch timing
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$ref: /schemas/types.yaml#/definitions/uint32-array
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oneOf:
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- maxItems: 1
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items:
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description: typical number of pixels
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- minItems: 3
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maxItems: 3
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items:
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description: min, typ, max number of pixels
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hsync-len:
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description: Horizontal sync length panel timing
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$ref: /schemas/types.yaml#/definitions/uint32-array
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oneOf:
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- maxItems: 1
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items:
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description: typical number of pixels
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- minItems: 3
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maxItems: 3
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items:
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description: min, typ, max number of pixels
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vfront-porch:
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description: Vertical front porch panel timing
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$ref: /schemas/types.yaml#/definitions/uint32-array
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oneOf:
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- maxItems: 1
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items:
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description: typical number of lines
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- minItems: 3
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maxItems: 3
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items:
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description: min, typ, max number of lines
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vback-porch:
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description: Vertical back porch panel timing
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$ref: /schemas/types.yaml#/definitions/uint32-array
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oneOf:
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- maxItems: 1
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items:
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description: typical number of lines
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- minItems: 3
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maxItems: 3
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items:
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description: min, typ, max number of lines
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vsync-len:
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description: Vertical sync length panel timing
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$ref: /schemas/types.yaml#/definitions/uint32-array
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oneOf:
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- maxItems: 1
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items:
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description: typical number of lines
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- minItems: 3
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maxItems: 3
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items:
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description: min, typ, max number of lines
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hsync-active:
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description: |
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Horizontal sync pulse.
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0 selects active low, 1 selects active high.
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If omitted then it is not used by the hardware
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [0, 1]
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vsync-active:
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description: |
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Vertical sync pulse.
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0 selects active low, 1 selects active high.
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If omitted then it is not used by the hardware
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [0, 1]
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de-active:
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description: |
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Data enable.
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0 selects active low, 1 selects active high.
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If omitted then it is not used by the hardware
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [0, 1]
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pixelclk-active:
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description: |
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Data driving on rising or falling edge.
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Use 0 to drive pixel data on falling edge and
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sample data on rising edge.
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Use 1 to drive pixel data on rising edge and
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sample data on falling edge
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [0, 1]
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syncclk-active:
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description: |
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Drive sync on rising or sample sync on falling edge.
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If not specified then the setup is as specified by pixelclk-active.
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Use 0 to drive sync on falling edge and
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sample sync on rising edge of pixel clock.
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Use 1 to drive sync on rising edge and
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sample sync on falling edge of pixel clock
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [0, 1]
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interlaced:
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type: boolean
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description: Enable interlaced mode
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doublescan:
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type: boolean
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description: Enable double scan mode
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doubleclk:
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type: boolean
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description: Enable double clock mode
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required:
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- clock-frequency
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- hactive
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- vactive
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- hfront-porch
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- hback-porch
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- hsync-len
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- vfront-porch
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- vback-porch
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- vsync-len
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additionalProperties: false
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...
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